FYI, Bridgestone makes radial inner tubes in exactly the right sizes for the TBS (I'm pretty sure it's the primary application of the tubes, to be honest). They have right-angle valves, and are about half the price of the Metzeler ones. I'm using them now in my bike, and have had no problems. They do seem to leak about a 1lb. of air a week, front and rear, but I hear that's pretty common.
http://www.mawonline.com/tubes.htm
Scroll down to Bridgestone Radial Tire Tubes
[ This message was edited by: geoelectric on 2006-08-26 16:38 ]